AAON HB-005 - Manual (Page 13)

13
Setting the Unit
Units should always be installed level, and above
water drainage routes. Unit operation can be affected
by wind. It is good practice to position unit condensing
sections away from prevailing winds.
Protective Shipping Brackets
Before setting the unit into its final position on the slab
or curb, be sure to remove the protective shipping
brackets, or “bumpers” from the perimeter of the unit’s
base.
Ground Setting
Set the unit on a solid slab high enough above the soil
grade to allow water to drain away from the base of
the unit. The unit should be set on a slab that has
been placed over compact, level earth. A poured
concrete (permanent) slab is recommended.
Roof Setting w/ Curb
Mount roof curbs first, and locate so duct connections
will clear any structural members of the building.
When using the factory curb, make openings in roof
decking large enough to allow for duct penetrations
and workspace only. Do not make openings larger
than necessary. Set the curb to coincide with the
openings. CURB MUST BE LEVEL.
Hoisting
Lifting lugs are provided on each corner of the top of
the unit.
If cables or chains are used to hoist the unit, they must
be the same length, and care should be taken to
prevent damage to the unit.
It is recommended that the unit be hoisted with the
outside air hood (if present) in the shipped position.
However, the unit may be hoisted with the outside air
hood in an open position.
Before lifting unit, be sure that all shipping material is
removed. Secure hooks and cables at all lifting
points/lugs provided on the unit.
Prior to setting the unit onto the roof curb, be sure that
the gasket material has been applied to all curb
surfaces meeting with the unit.
Hoist unit to a point directly above the curb and duct
openings. Carefully lower and align the unit’s utility
and duct openings so the unit perimeter fits around the
curb. Make sure the unit is properly seated on the
curb and is level.
Outside Air Hood (Optional)
Units equipped with outside air intake will have an
outside air hood. The outside air hood must be
opened prior to unit operation.
Remove shipping screws from each side of the hood in
the “closed” position. Lift hood to the “open” position,
seal flange, and secure with sheet metal screws.
Outdoor air intake adjustments should be made
according to building ventilation, or local code
requirements.
PRIOR TO SETTING UNIT ON CURB – To ensure
proper isolation and seal between the unit and the
curb, gasket material MUST BE APPLIED to the
curb on ALL SURFACES meeting with the unit.
NOTE
Figure 13a, Removing Shipping Brackets